how pdist2 works

I have two mat files, template1_1.mat and template1_2.mat.

template1_1.mat :

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     1     1     1     1     1     1     1     1     1     1     1     1     0     0     1     1     1
     0     0     0     0     0     0     0     0     1     0     0     0     1     1     0     0     0     0     1
     0     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     0     1
     0     0     0     0     0     0     0     0     0     0     0     0     0     1     1     1     1     0     1

template1_2.mat:

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     0     0     1     1     1     1     1     1     1     1     1     1     1     1     0     0     0
     0     1     0     0     0     1     1     1     1     1     1     1     0     1     1     1     1     1     0
     0     1     1     0     0     1     1     1     1     1     1     1     1     1     1     1     1     1     1
     0     1     1     1     0     1     1     1     0     1     1     1     1     1     1     1     1     1     1

When I calculate hamming distance between these two files using this code:

HD = pdist2(template1_1,template1_2,'hamming');

Then the output is 0.0057

Can anyone explain to me how it works? Thank in advance!